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来做题

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拖延症↘患者

#1 Created at ... [Delete] [Delete and Lock User]

def trim(s):

    if not isinstance(s,str):

        raise TypeError('请输入字符串')

    if s:

        while len(s)>0 and s[0]==' ':

            s=s[1:]

        while len(s)>0 and s[-1]==' ':

            s=s[:-1]

    return s

# 测试:

if trim('hello  ') != 'hello':

    print('测试失败!')

elif trim('  hello') != 'hello':

    print('测试失败!')

elif trim('  hello  ') != 'hello':

    print('测试失败!')

elif trim('  hello  world  ') != 'hello  world':

    print('测试失败!')

elif trim('') != '':

    print('测试失败!')

elif trim('    ') != '':

    print('测试失败!')

else:

    print('测试成功!')

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